JPH0726239B2 - How to collect the plating solution - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention collects a plating solution brought out during plating on the surface of an object to be plated and collects a reused plating solution. It is about the method.

[Conventional technology]

A conventional apparatus for collecting the taken-out plating liquid of this type has been constructed and reused as schematically shown in FIG. That is, in FIG. 2, reference numeral 1 is a plating apparatus, which is a plating treatment tank 5 in which the plating solution 2 is accommodated, and a recovery dilution plating solution 4 which is taken out as a carry-out plating solution 3 by being attached to an object to be plated. Diluted plating liquid tank to be stored 6,
Each of the wash water tanks 7 stores the collected wash water 10. Reference numeral 8 is a first recovery stock tank in which the recovered diluted plating solution 4 is stored, and 9 is a recovery device, and the recovered diluted plating solution 4 from the first recovery stock tank 8 is taken in and concentrated, and is generated at this time. The steam in the condenser in the recovery device 9 is recovered and used as washing water 10. On the other hand, the concentrated plating solution is stored in the second recovery stock tank 12 as the recovery stock solution 11 and is recovered in the plating treatment tank 5 as the recovery return solution 13.

Next, the operation will be described.

The plating solution 2 in the plating processing tank 5 of the plating apparatus 1 adheres to the product that is the object to be plated and becomes the carry-out plating solution 3, which is stored in the first recovery stock tank 8 as the recovery dilution plating solution 4. The collected water is concentrated by using the collecting device 9, and the water vaporized at that time is converted into water by the condenser in the collecting device 9 and is collected and used as the washing water 10.

On the other hand, the recovered diluted plating solution 4 is concentrated to the concentration of the plating solution, recovered as the recovered stock solution 11 in the second recovered stock tank 12, and then returned to the plating processing tank 5 as the recovered return solution 13 for plating. Liquid is being collected.

[Problems to be Solved by the Invention]

The recovery method of the plating solution configured as described above is such that the recovered diluted plating solution 4 carried out as the carried-out plating solution 3 is
Although it is possible to collect the plating solution of strong acid or strong alkali type, the plating solution that is easily diluted and changed by the plating solution of neutral type or the like is decomposed and the components of the plating solution are decomposed when concentrated and collected. There was a problem that it could not be used.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a method of recovering a plating solution that enables concentrated recovery of a recovery diluted plating solution that is likely to change.

[Means for Solving the Problems]

The method of recovering a plating solution according to the present invention is a method of recovering after collecting a high concentration basic solution as a plating solution into which a component of the plating solution is not decomposed even if concentrated before collecting the recovered diluted plating solution into the recovery apparatus. The diluted plating solution is taken in, concentrated and recovered.

[Action]

In the present invention, a high-concentration basic solution that does not decompose the components of the plating solution even if concentrated is used as the plating solution, and the plating solution is taken into the recovery device before the recovery diluted plating solution is taken in and then the recovery diluted plating solution is taken in. Since it is concentrated in, the effect of the stabilizer added to the plating solution works, there is no decomposition change of the plating solution even if it is heated and concentrated, and the brought-out plating solution is recovered in a state that can be used as the plating solution. it can.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, the same reference numerals as those in FIG.
14 is a high-concentration basic liquid in which the components of the plating liquid are not decomposed even when concentrated, and is stored in the plating treatment tank 5 as the plating liquid 2.

In this operation, before the collected diluted plating solution 4 is taken into the collecting device 9, the high-concentration basic liquid 14 is taken into the collecting device 9 to start the concentration operation, and the water vaporized at the time of concentration is collected into the collecting device 9.
It is made into water with the condenser of and collected as wash water 10. After this, it is circulated as washing water 10. Plating solution above a certain level,
For example, the recovered stock solution 11 that has been concentrated approximately twice is recovered in the second recovered stock tank 12, taken out as the recovered return solution 13, and returned to the plating processing tank 5 as supplementary plating to be recovered by a completely closed system.

When the plating solution recovery method of the present invention is used, the plating solution is not decomposed at all because the high-concentration basic solution 14 is the concentrated basic solution. This is because if the plating solution is kept at a high concentration to some extent, the plating solution can be heated to about 50 ° C by vacuum concentration due to the effect of chemicals added as a stabilizer of the plating solution. There was no decomposition, and even if the concentration of 15% was concentrated to 75%, and it was diluted to the standard and plated as the plating solution concentration, good plating could be obtained. Specific examples are shown below.

The concentrated liquid can also be used as a sufficient replenisher.

Further, the use of the present invention can significantly reduce the cost.

〔The invention's effect〕

As described above, according to the present invention, a high-concentration basic liquid that does not decompose the components of the plating solution even if it is concentrated before the recovered diluted plating solution is taken into the recovery apparatus is introduced into the recovery apparatus as the plating solution for concentration and recovery. Therefore, it is easy to collect the take-out plating solution that could not be collected before, and it can be used as a recycled plating solution (take-out plating solution 100l / day x 25 days x 12 months x l / 2500 yen = 75000 yen / year). The cost reduction effect in the conventional plating line is remarkable, and the wastewater treatment is unnecessary because it is recovered and reused.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining an embodiment of a plating liquid recovery method of the present invention, and FIG. 2 is a block diagram for explaining a conventional plating liquid recovery method. In the figure, 1 is a plating device, 2 is a plating solution, 3 is a bring-out plating solution, 4 is a recovery dilution plating solution, 5 is a plating treatment tank, 6 is a dilution plating solution tank, 7 is a washing water tank, and 8 is a first recovery. A stock tank, 9 is a recovery device, 10 is washing water, 11 is a recovery stock solution, 12 is a second recovery stock solution, 13 is a recovery return solution, and 14 is a high-concentration basic solution. The same reference numerals in each drawing indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A recovery dilution plating solution, which is diluted by mixing the plating solution that has been brought out of the plating processing tank by adhering to the object to be plated and recovered, to a recovery device. In the method of recovering the plating liquid, which collects the steam generated during the intake and concentration as the washing water and returns the concentrated liquid concentrate to the plating treatment tank as the recovery return plating liquid, the recovery dilution plating is performed in the recovery device. It is characterized in that a high-concentration basic liquid that does not decompose the components of the plating liquid even if it is concentrated before taking in the liquid is taken into the recovery device as the plating liquid, and then the recovered diluted plating liquid is taken in and concentrated. How to recover the plating solution.